Silicone baking pans - how to clean them

Silicone baking pans really keep the fat or grease on them even though you have tried to wash them etc. it just does not get rid of the grease. So after washing it and once you are using the pan again, it still has a greasy film over it. This has nothing to do with quality of the silicone baking pan. All you have to do to get it clean and get rid of the greasy layer, just put it in boiling salt water and it will be clean again.